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TPS2595: TPS259570 start up at CC mode

Jim Tsai
Expert 4470 points
Part Number: TPS2595
Other Parts Discussed in Thread: TPS25947, TPS2596,

Hi,

Before TPS259570 enable, customer use E-load to apply 1.6A at CC mode. Then enable the TPS259570 and found there is no output. But when the E-load set to CR mode, the output is normal.

If we reduce load to from 1.6A to 1A at CC mode, the output is normal.

Is that trigger inrush current protection or something?

 

System setting:

Vin = 3.3V

Vout =3.3V

Iout = 1.6A

ILIMIT ~= 4.17A (RILM = 487 Ω)

 

E-Load is set to CC mode:

CH1:Vout, CH2: Vin, CH3: EN, CH4: Iout.

                                                                         

E-Load is set to CR mode:

CH1:Vout, CH2: Vin, CH3: EN, CH4: Iout.

  • 0
    TI__Guru 50335 points

    Hi Jim,

    Thanks for reaching out.

    This response is expected. CC load are designed to take constant current at very low voltages.

    So initially at startup when output voltage is very low CC load will be drawing some current. Now our eFuse device has foldback current limit functionality protection feature which means that when output voltage is very low the device current limit will be very low then set current limit. So when CC load tries to draw current at very low output voltage greater than this foldback current limit it will be not able to source that current and will try to hold down output voltage to zero.

    CR load or resistive load will not be drawing so much current at such low voltage so the device will be able to give that current and output voltage will start ramping.

    We always recommend to test device with resistive load or end real load. 

    Regards

    Kunal Goel

  • 0 in reply to Kunal Goel
    TI__Expert 4470 points

    Hi Goel,

    Thanks for the response~

    BTW, is the foldback current limit describe in datasfeet?

  • +1 in reply to Jim Tsai
    TI__Guru 50335 points

    Hi Jim,

    For TPS2595 it is not mentioned in datasheet but its present in our latest eFuse devices. Its mentioned in datasheets of TPS2596 ,TPS25947

    Regards

    Kunal Goel